THOUGHTLESS

adj. 1 inconsiderate, rude, impolite, insensitive, tactless, undiplomatic, untactful, unthinking It was thoughtless of you to mention her son, who is serving time for possession of drugs 2 rash, imprudent, negligent, foolish, stupid, careless, neglectful, reckless, silly, unthinking, unreflective, absent-minded, forgetful, remiss, ill-considered, heedless, inadvertent, inattentive: How thoughtless of me to forget your birthday!